Elisa, I looked at Peanut last night (1977 20' Argosy) and in order to fit the same electric steps that I installed on my Argosy and on a 310 there is a 1"x2" section of steel tubing that would need to be removed. Any competent welding/fabrication shop should be able to remove it with minimal effort.
At that point it wouldn't take a whole lot of effort to install the electric steps. The job would require some metal fabrication and possibly welding but not a great deal.
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)